/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *
 *  (C) 2003 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"

/*
static char MTEST_Descrip[] = "Test the handling of BSend operations when a detach occurs before the bsend data has been sent.";
*/

int main( int argc, char *argv[] )
{
    int errs = 0;
    int rank, size, source, dest;
    unsigned char *buf, *bufp;
    int minsize = 2; 
    int i, msgsize, bufsize, outsize;
    unsigned char *msg1, *msg2, *msg3;
    MPI_Comm      comm;
    MPI_Status    status1, status2, status3;

    MTest_Init( &argc, &argv );

    /* The following illustrates the use of the routines to 
       run through a selection of communicators and datatypes.
       Use subsets of these for tests that do not involve combinations 
       of communicators, datatypes, and counts of datatypes */
    msgsize = 128 * 1024;
    msg1 = (unsigned char *)malloc( 3 * msgsize );
    msg2 = msg1 + msgsize;
    msg3 = msg2 + msgsize;
    while (MTestGetIntracommGeneral( &comm, minsize, 1 )) {
	if (comm == MPI_COMM_NULL) continue;
	/* Determine the sender and receiver */
	MPI_Comm_rank( comm, &rank );
	MPI_Comm_size( comm, &size );
	source = 0;
	dest   = size - 1;

	/* Here is the test:  The sender */
	if (rank == source) {
	    /* Get a bsend buffer.  Make it large enough that the Bsend
	       internals will (probably) not use a eager send for the data.
	       Have three such messages */
	    bufsize = 3 * (MPI_BSEND_OVERHEAD + msgsize);
	    buf     = (unsigned char *)malloc( bufsize );
	    if (!buf) {
		fprintf( stderr, "Unable to allocate a buffer of %d bytes\n",
			 bufsize );
		MPI_Abort( MPI_COMM_WORLD, 1 );
	    }
	    
	    MPI_Buffer_attach( buf, bufsize );

	    /* Initialize the buffers */
	    for (i=0; i<msgsize; i++) {
		msg1[i] = 0xff ^ (i & 0xff);
		msg2[i] = 0xff ^ (3*i & 0xff);
		msg3[i] = 0xff ^ (5*i & 0xff);
	    }

	    /* Initiate the bsends */
	    MPI_Bsend( msg1, msgsize, MPI_CHAR, dest, 0, comm );
	    MPI_Bsend( msg2, msgsize, MPI_CHAR, dest, 0, comm );
	    MPI_Bsend( msg3, msgsize, MPI_CHAR, dest, 0, comm );

	    /* Synchronize with our partner */
	    MPI_Sendrecv( 0, 0, MPI_CHAR, dest, 10, 
			  0, 0, MPI_CHAR, dest, 10, comm, MPI_STATUS_IGNORE );

	    /* Detach the buffers.  There should be pending operations */
	    MPI_Buffer_detach ( &bufp, &outsize );
	    if (bufp != buf) {
		fprintf( stderr, "Wrong buffer returned\n" );
		errs++;
	    }
	    if (outsize != bufsize) {
		fprintf( stderr, "Wrong buffer size returned\n" );
		errs++;
	    }
	}
	else if (rank == dest) {
	    double tstart;

	    /* Clear the message buffers */
	    for (i=0; i<msgsize; i++) {
		msg1[i] = 0;
		msg2[i] = 0;
		msg3[i] = 0;
	    }

	    /* Wait for the synchronize */
	    MPI_Sendrecv( 0, 0, MPI_CHAR, source, 10, 
			  0, 0, MPI_CHAR, source, 10, comm, MPI_STATUS_IGNORE );

	    /* Wait 2 seconds */
	    tstart = MPI_Wtime();
	    while (MPI_Wtime() - tstart < 2.0) ;

	    /* Now receive the messages */
	    MPI_Recv( msg1, msgsize, MPI_CHAR, source, 0, comm, &status1 );
	    MPI_Recv( msg2, msgsize, MPI_CHAR, source, 0, comm, &status2 );
	    MPI_Recv( msg3, msgsize, MPI_CHAR, source, 0, comm, &status3 );

	    /* Check that we have the correct data */
	    for (i=0; i<msgsize; i++) {
		if (msg1[i] != (0xff ^ (i & 0xff))) { 
		    if (errs < 10) {
			fprintf( stderr, "msg1[%d] = %d\n", i, msg1[i] );
		    }
		    errs++;
		}
		if (msg2[i] != (0xff ^ (3*i & 0xff))) {
		    if (errs < 10) {
			fprintf( stderr, "msg2[%d] = %d\n", i, msg2[i] );
		    }
		    errs++;
		}
		if (msg3[i] != (0xff ^ (5*i & 0xff))) {
		    if (errs < 10) {
			fprintf( stderr, "msg2[%d] = %d\n", i, msg2[i] );
		    }
		    errs++;
		}
	    }
	    
	}
		
	
	MTestFreeComm( &comm );
    }
    free( msg1 );

    MTest_Finalize( errs );
    MPI_Finalize();
    return 0;
}
